It is known as one of the largest and most efficient metropolitan transit systems in the United States. In 2014, it became the first major transit system to use electric buses for regular service.

Ujamaa Construction (“UJAMAA”) and McHugh construction were awarded the Illinois Medical District Rehabilitation Project consisting of the renovation to the Damen, Paulina and Ogden Avenue station entrances.

The Damen and Paulina Street stationhouses and concourses received structural reinforcements, upgraded exterior envelopes & interior improvements. The Ogden Avenue station house entrance was reconstructed and expanded providing new upgraded electrical service, elevator access to the platform as well as reinforced structural components. Platform restorations and improvements were also incorporated through the station. All three station entrances are ADA compliant and incorporated lighting improvements, communication system improvements and signage upgrades.